Streptococcus
Streptococcus are
spherical,
gram-positive bacteria. They are included among the
Firmicutes. These bacteria grow in chains or pairs, with
cell division occurring only along one axis. In this sense they are contrasted with
Staphylococcus, which divides along several axes, generating a "
cluster" of
cellss, which resemble clusters of
grapes.
Members of the genus Streptococcus which cause disease include:
- Group A Streptococci (Streptococcus pyogenes) which causes strep throat
- Group B Streptococci (Streptococcus agalactiae) which causes meningitis in neonates and the elderly, with occasional systemic bacteremia.
- Group D Streptococci (S. faecalis, S. faecium, S. durans, S. avium, S. bovis)